The Flexaust Flexadux R-3 PVC duct hose, used for ventilation, dust removal, and fume extraction applications, is a heavyweight blue PVC hose, reinforced with a coated spring steel wire helix; it resists chemicals, moisture, and both internal and external abrasion, and is flexible and compressible for easy manipulation and installation. A temperature range of 20 to 160 degrees F makes it suitable for applications such as shipyard ventilation and sand extraction. This duct hose has a wall thickness of 0.035 inch (for diameters from 1.5 to 3.5 inches) or 0.045 inch (for diameters from 4 to 12 inches), and is made from flame-retardant materials per the UL 94V-0 Flammability standard.

Duct hoses are flexible or rigid tubes that convey gases, liquids, and lightweight bulk materials from one location to another. They are made from an array of materials that range from polyurethane and thermoplastic rubber, to PVC and aluminum-coated fiberglass fabric, and are typically reinforced with a steel wire or rigid plastic helix, also known as a “spiral.” Duct hoses are secured with hose clamps or U-bolts, and two pieces of hose are joined with a hose connector. Common applications for duct hoses include heating and cooling, ventilation, fume and smoke exhaust, vacuum cleaning, moving chips and shavings, handling bulk packing materials, and water and waste discharge.

Flexaust manufactures flexible hose, metal ducting, and accessories for industrial and commercial applications. The company, founded in 1938 and headquartered in San Diego, CA, is part of the international Schauenburg Group.